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Steel wool

The way it was explained to me, you use steel wool, then manure then
4" of fine sand. Under anaerobic conditions, Ferric oxide is
converted to Ferrous oxide.

I've been doing this for years as have several people I know. No

Richard J. Sexton
richard at aquaria_net
Bannockburn, Ontario, Canada                       +1 (613) 473 1719